makefile: cleanup

Makefile

@@ -3,6 +3,20 @@ all: build
 XSOCK=/tmp/.X11-unix
 XAUTH=/tmp/.docker.xauth
 
+CAPABILITIES = \
+	--cap-add=SYS_ADMIN
+
+ENV_VARS= \
+	--env="USER_UID=$(shell id -u)" \
+	--env="USER_GID=$(shell id -g)" \
+	--env="DISPLAY" \
+	--env="XAUTHORITY=${XAUTH}" \
+
+VOLUMES = \
+	--volume=${XSOCK}:${XSOCK} \
+	--volume=${XAUTH}:${XAUTH} \
+	--volume=/run/user/$(shell id -u)/pulse:/run/pulse
+
 help:
 	@echo ""
 	@echo "-- Help Menu"
@@ -25,13 +39,8 @@ install uninstall: build
 google-chrome tor-browser chromium-browser firefox bash:
 	@touch ${XAUTH}
 	@xauth nlist :0 | sed -e 's/^..../ffff/' | xauth -f ${XAUTH} nmerge -
-	@docker run -it --rm \
-		--cap-add=SYS_ADMIN \
-		--env="USER_UID=$(shell id -u)" \
-		--env="USER_GID=$(shell id -g)" \
-		--env="DISPLAY" \
-		--env="XAUTHORITY=${XAUTH}" \
-		--volume=${XSOCK}:${XSOCK} \
-		--volume=${XAUTH}:${XAUTH} \
-		--volume=/run/user/$(shell id -u)/pulse:/run/pulse \
+	docker run -it --rm \
+		${CAPABILITIES} \
+		${ENV_VARS} \
+		${VOLUMES} \
 		${USER}/browser-box:latest $@